A little links page for you.  If you see a link to a dealers site, it's here because I've bought from them and would recomend them to others.  If they're not listed here, I either haven't bought from them or didn't think enough of them when I did!
Other Online Galleries
Amazing Comic Art - Spiderman as done by everyone!  A nicely laid out site by the major players who have drawn Spiderman.
Amazing Fantasy 15 - A website devoted to Spiderman artwork.
AWLipson Comic Art - Art by the likes of Hughes, Dave Johnson, Kieth and many others.
Batgirl Online - Batgirl as drawn by everyone!!
The Cliff Guy - Drawings of cliff's...The best theme collection out there!
The Collecting Fool - Fool eh? Not too big a fool with the likes of Kaluta and Frazetta featuring in a collection!
Comic Art Attack - A diverse collection well worth checking out.
Comic Art Collection - A huge collection of John Byrne art and some misc. art.
Comic Art Fans - A very cool site with a vast array of collectors art on display.
Comic Art Geek - A slight Batman fetish going on here. Some seriously good comic art from just about every artist you could want to see.
ComicArt-L - A gallery which allows the members of it to display up to 10 pieces of their artwork.
Comic Cafe - A modest collection, the focal point being Trimpe Hulk art.
Comic Retro - DC fanboy extraordinaire! Commissions, sketches, splashes...but panel pages? Surely they are the work of the DEVIL!!
Dave's Gallery of Original Comic Art - 2 themed commission gallaries (Art Nouveau & Dancing Girls) and a misc gallery of pieces.
Four Color Theater - Like my own collection, Allred takes pride of place. Some great pieces!
Foreigner 1999's Comic Art Collection - Some real jems on display, the man likes Charest!
Jay's Original Comic Art - A well rounded collection but a definite leaning towards the animation art by the likes of Glines, Noto and Timm.
My Comic Art.com - The man has everything!!
My Thanos Art - Thanos is main attraction here, but closely followed by Charest, Kirby Jim Lee, McFarlane, Jim Starlin and more besides!  Look and weep!
Nick Ford's collection - A fellow UK art collector with pieces from Alan Davis and Bill Sienkiewicz taking pride of place.
Nighthawk Comics - Showcasing the likes of Adams, Gibbons, Kirby, Miller & Starlin
Rich's Comic Art Page - A HUGE collection of various artists.
Royd's Original art Gallery - Various pieces by some top artists.
Sandman Commission Gallery - Commission mainly done by artists from the series and of the main characters, not just Sandman.
Steve's Art Room - Pieces by Cassaday, Mack, Mignola...the man has good taste!!
Original Art Dealers
Albert Moy - Originals by just about anyone you can think of, and the rep for Cassady, Cooke, Sam Kieth, Jae Lee, Jim Lee & Bruce Timm.
Anthony's Collectables - a VAST array of pieces for sale here, and handling sales for the very talented Alex Maleev.
Artwork World - Phillip has a huge inventory of modern artists to choose from, and he's the rep for Doug Mahnke.
Brit Comic Art - selling pages by top British talent like Bolton, Fabry, Lloyd & McCrea
Comic Art Links - despite being exactly what it says, a comic art links site, Shawn also reps a few artists, Kalman Andrasofszky being the pick of the litter.
Comic Art Source - Adan sells art for Rick Mays and has a stack of pieces for sale from various other artists.
D-O-A (Distinctive Original Art) - Selling artwork for the likes of Carlos Pacheco, Steve Rude and Matt Wagner among others.
Fanfare Sports & Entertainment - Lots of pages by various artists at good prices!
Graphic Collectables - There is art for sale here from just about everyone you can imagine!!
Moth Comixs - Representing some fine artists like George Pratt & John Van Fleet with lots of other original art for sale too.
Red Sector Art - Selling original art by the likes of Eduardo Risso and a host of top European talent.  Lots of US pieces for sale too.
Splash Page Art - Some tasty artists work on offer here, selling for Michael Lark, Tim Bradstreet, Sean Philips & Cully Hamner. Various other artists pages on sale also.
Artists
Mike Allred - Easily one of my favourite artists, especially the artwork on the early Madman issues.
John Cassaday - Artist for Planetary.  A very nicely set out website well worth checking out.
Farel Dalryample - Works include Caper and the creator owned Pop Gun War.
Gene Ha - Artist from Top Ten and not enough besides!
James Jean - Currently doing some knock out covers for Fables and some sweet covers for Batgirl. Go check it out!
Steve Rude - A hugh acrhive section showing private commission pieces.
Characters
Hellboy: A Plauge of Frogs - Masses of Hellboy releated stuff.  Take a day off and surf!
Kabuki - Noh TV - Online comic for you to read (and admire) plus a David Mack checklist.  A real nice site!
Essential
Dragonberry Comic Art Links - The site with it all.  A massive resource for collection galleries, artists sites, dealer sites and a few other catagories!  Do yourself a favour and click on a few links!